David A. Nadler was a principal and co–founder of Nadler Advisory Services, a firm that consults with boards of directors, CEOs, and executive teams on issues of leadership, governance, and team effectiveness. Nadler Advisory Services was formed after Dr. Nadler’s retirement in late 2013 after seven years as vice chairman of Marsh McLennan Companies. Dr. Nadler specialized in research and writing on organizational change, corporate governance, organization design, and executive teams. He passed away in 2015.